1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kevin Fall.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #ifndef lint
36 static const char copyright[] =
37 "@(#) Copyright (c) 1989, 1993\n\
38 The Regents of the University of California. All rights reserved.\n";
39 #endif /* not lint */
40
41 #ifndef lint
42 #if 0
43 static char sccsid[] = "@(#)mknod.c 8.1 (Berkeley) 6/5/93";
44 #endif
45 static const char rcsid[] =
46 "$FreeBSD: stable/12/sbin/mknod/mknod.c 326025 2017-11-20 19:49:47Z pfg $";
47 #endif /* not lint */
48
49 #include <sys/types.h>
50 #include <sys/stat.h>
51
52 #include <err.h>
53 #include <errno.h>
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <unistd.h>
57 #include <grp.h>
58 #include <pwd.h>
59 #include <string.h>
60
61 static void
usage(void)62 usage(void)
63 {
64
65 (void)fprintf(stderr,
66 "usage: mknod name\n"
67 " mknod name [b | c] major minor [owner:group]\n");
68 exit(1);
69 }
70
71 static u_long
id(const char * name,const char * type)72 id(const char *name, const char *type)
73 {
74 u_long val;
75 char *ep;
76
77 /*
78 * XXX
79 * We know that uid_t's and gid_t's are unsigned longs.
80 */
81 errno = 0;
82 val = strtoul(name, &ep, 10);
83 if (errno)
84 err(1, "%s", name);
85 if (*ep != '\0')
86 errx(1, "%s: illegal %s name", name, type);
87 return (val);
88 }
89
90 static gid_t
a_gid(const char * s)91 a_gid(const char *s)
92 {
93 struct group *gr;
94
95 if (*s == '\0') /* Argument was "uid[:.]". */
96 errx(1, "group must be specified when the owner is");
97 return ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid;
98 }
99
100 static uid_t
a_uid(const char * s)101 a_uid(const char *s)
102 {
103 struct passwd *pw;
104
105 if (*s == '\0') /* Argument was "[:.]gid". */
106 errx(1, "owner must be specified when the group is");
107 return ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid;
108 }
109
110 int
main(int argc,char ** argv)111 main(int argc, char **argv)
112 {
113 int range_error;
114 uid_t uid;
115 gid_t gid;
116 mode_t mode;
117 dev_t dev;
118 char *cp, *endp;
119 long mymajor, myminor;
120
121 if (argc != 2 && argc != 5 && argc != 6)
122 usage();
123
124 if (argc >= 5) {
125 mode = 0666;
126 if (argv[2][0] == 'c')
127 mode |= S_IFCHR;
128 else if (argv[2][0] == 'b')
129 mode |= S_IFBLK;
130 else
131 errx(1, "node must be type 'b' or 'c'");
132
133 errno = 0;
134 mymajor = (long)strtoul(argv[3], &endp, 0);
135 if (endp == argv[3] || *endp != '\0')
136 errx(1, "%s: non-numeric major number", argv[3]);
137 range_error = errno;
138 errno = 0;
139 myminor = (long)strtoul(argv[4], &endp, 0);
140 if (endp == argv[4] || *endp != '\0')
141 errx(1, "%s: non-numeric minor number", argv[4]);
142 range_error |= errno;
143 dev = makedev(mymajor, myminor);
144 if (range_error || major(dev) != mymajor ||
145 (long)(u_int)minor(dev) != myminor)
146 errx(1, "major or minor number too large");
147 } else {
148 mode = 0666 | S_IFCHR;
149 dev = 0;
150 }
151
152 uid = gid = -1;
153 if (6 == argc) {
154 /* have owner:group */
155 if ((cp = strchr(argv[5], ':')) != NULL) {
156 *cp++ = '\0';
157 gid = a_gid(cp);
158 } else
159 usage();
160 uid = a_uid(argv[5]);
161 }
162
163 if (mknod(argv[1], mode, dev) != 0)
164 err(1, "%s", argv[1]);
165 if (6 == argc)
166 if (chown(argv[1], uid, gid))
167 err(1, "setting ownership on %s", argv[1]);
168 exit(0);
169 }
170